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There is no official Google Drive Client available for Linux at the moment, but a command line program called Grive provides an open source Linux solution. What was missing was an easy setup, install and desktop integration on Ubuntu that way born Ubuntu Google Drive Client with Grive and Grive Tools.

Features:

Grive Tools will assist in the installation and setup of Google Drive on your Ubuntu desktop.
Grive Tools consists of the following components:
Grive Setup -- The main setup installation program to get started.
Grive Indicator -- Application indicator for Google Drive.
A GUI installation will guide you through the the installation process and setup Google Drive in your home folder.
You will be able to access your Google Drive files locally* as well as synchronize your files with your Google Drive online. (* excluding Google Docs)
Auto Sync -- Grive Tools keeps your Google Drive synchronized automatically by detecting changes in your local Google Drive folder. New files and folders will be uploaded to your Google Drive automatically after a few seconds.
Bi-Directional Sync -- When you Sync your Google Drive new files online will be downloaded to your local folder and new local files will be uploaded to your Google Drive online.
The Grive Application Indicator supports both light and dark desktop themes.
On Screen notifications of Google Drive activity.
Supported Desktops include Unity, Gnome, KDE, Xfce, Cinnamon and LXDE
Supported languages : Afrikaans, English, Spanish, Dutch, German, French, Italian, Portuguese, Russian, Serbian, Polish, Czech, Arabic and Japanese (more translations soon)
For users that require more features like choosing which folder to sync with Google Drive, and interval sync of online files, have a look at overGrive.

Limitations:

Auto Sync only detects changes in your local Google Drive files and folders.
Symbolic links are not supported
Downloading Google Documents is not yet possible.

Notes:

To un-install Grive Tools simply remove via the Ubuntu Software Center or from command line with : sudo apt-get remove grive-tools
Installation log files can be found at : ~/.grive-setup.log
For detailed logs after each sync see ~/.grive-last-sync.log
The application has been tested on Ubuntu 12.10, 13.04, 13.10 and 14.04 -- 64bit and 32bit.